Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

April 13, 2021Jackson County, Oklahoma

NWS Norman, OK issued this special weather statement at Apr 13, 2021, 9:20 PM CDT for Jackson County, Oklahoma. It was in force for 25 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 13, 2021, 9:20 PM CDT (02:20 UTC)
Expired
Apr 13, 2021, 9:45 PM CDT
In force
25 min
Issued by
NWS Norman, OK

County Jackson County, OK

The radar

The Altus AFB radar (KFDR), 55 km from the middle of the area, began a volume at 02:21 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.3 hours before the alert went out and 189 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2021-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2021-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -82 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2336 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
-82 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

As transmitted.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this special weather statement went out at Apr 13, 7:58 PM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, Apr 13, 7:58 PM CDT, 1 hour 22 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Apr 13, 1:48 PM CDT, 7 hours 32 minutes before
Hazardous Weather Outlook
National Weather Service Norman OK
148 PM CDT Tue Apr 13 2021

OKZ004>048-050>052-TXZ083>090-141900-
Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield-
Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne-
Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain-
Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson-
Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton-
Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman-
Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay-
148 PM CDT Tue Apr 13 2021

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...This Afternoon and Tonight...

.Thunderstorms...
More widespread thunderstorm chances return mainly to western
north Texas and the southern half of Oklahoma this evening into
early Wednesday morning. A few strong storms with hail up to the
size of nickels are possible with this activity, but severe
weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

.Thunderstorms...
Isolated to widely scattered thunderstorms will be possible
Wednesday afternoon mainly along and west of Interstate 35 and
south of Intestate 40. Occasional rain and thunderstorm chances
will continue Thursday and especially Friday. Severe thunderstorm
chances appear to be low during these times.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Local storm report, Apr 13, 7:21 PM CDT, 1 hour 59 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
721 PM CDT TUE APR 13 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0716 PM     HAIL             ELECTRA                 34.03N 98.92W
04/13/2021  E0.70 INCH       WICHITA            TX   AMATEUR RADIO

&&

JP
Special weather statement, Apr 13, 7:33 PM CDT, 1 hour 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
733 PM CDT Tue Apr 13 2021

TXZ083>085-140100-
Foard TX-Wilbarger TX-Hardeman TX-
733 PM CDT Tue Apr 13 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Foard...southwestern
Wilbarger and southeastern Hardeman Counties Until 800 PM CDT...

AT 732 PM CDT, a strong thunderstorm was located 4 miles southwest of
Thalia, moving northeast at 30 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3385 9963 3396 9974 3421 9938 3395 9920
TIME...MOT...LOC 0032Z 240DEG 26KT 3394 9961

..speg.
Local storm report, Apr 13, 7:39 PM CDT, 1 hour 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
739 PM CDT TUE APR 13 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0738 PM     HAIL             8 W BURKBURNETT         34.09N 98.70W
04/13/2021  E1.00 INCH       WICHITA            TX   TRAINED SPOTTER

&&

JP
Local storm report, Apr 13, 7:44 PM CDT, 1 hour 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
744 PM CDT TUE APR 13 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0744 PM     HAIL             3 W BURKBURNETT         34.09N 98.62W
04/13/2021  E1.00 INCH       WICHITA            TX   TRAINED SPOTTER

&&

JP
Special weather statement, Apr 13, 8:38 PM CDT, 42 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Apr 13, 9:20 PM CDT, 0 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 7:07 PM CDTSevere Thunderstorm WarningOUNTillman38 min
Apr 13, 7:45 PM CDTSevere Thunderstorm WarningOUNCotton45 min
Apr 13, 8:38 PM CDTSpecial Weather StatementOUNStephens37 min
Apr 14, 5:52 PM CDTSpecial Weather StatementOUNLove38 min
Apr 14, 6:29 PM CDTSpecial Weather StatementOUNLove, Marshall31 min
Apr 13, 7:33 PM CDTSpecial Weather StatementOUNWilbarger27 min
Apr 13, 7:41 PM CDTSevere Thunderstorm WarningOUNFoard, Wilbarger22 min
Apr 13, 10:02 PM CDTSevere Thunderstorm WarningOUNFoard, Wilbarger43 min
Apr 13, 10:44 PM CDTSpecial Weather StatementOUNWilbarger31 min
Apr 14, 12:41 PM CDTSpecial Weather StatementOUNKnox34 min
Apr 14, 1:51 PM CDTSpecial Weather StatementOUNBaylor24 min
Apr 14, 1:56 PM CDTSevere Thunderstorm WarningOUNBaylor24 min
Apr 14, 2:22 PM CDTSpecial Weather StatementOUNBaylor23 min
Apr 14, 2:51 PM CDTSpecial Weather StatementOUNArcher24 min
Apr 14, 3:16 PM CDTSpecial Weather StatementOUNArcher29 min
Apr 14, 3:49 PM CDTSpecial Weather StatementOUNClay26 min
Apr 14, 5:49 PM CDTSevere Thunderstorm WarningOUNBaylor41 min
Apr 14, 6:21 PM CDTSpecial Weather StatementOUNArcher24 min

Nearby

Special Weather Statements in Oklahoma, 2021Every special weather statement in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.